engleski

Green synthesis of organopalladium photosensitizers

The development of clean, fast, and cost-effective preparative methods is one of the objectives of green chemistry. The feasibility of the green chemistry concept is demonstrated on the synthesis of organopalladium compounds (palladacycles), important due to their wide application in organic synthesis and unique optical properties. The majority of synthetic steps in this thesis were performed by solid-state synthetic method, mechanochemistry and aging. Palladacycles with one or two metal-carbon and metal-donor bonds were prepared via C–H bond(s) activation in azobenzenes by various Pd(II) catalysts, and the exchange of their anionic or neutral ligands resulted in derivatives with different reactivity and optical properties. The described reactions were monitored in situ and ex situ by spectroscopic methods, which enabled the characterization of the species involved in the reactions, direct insight into the reaction pathways, insight into the factors controlling reactivity and selectivity, and optimization of the grinding process. The application of the developed methods and concepts will enable synthesis of new organopalladium compounds, direct and selective replacement of the C–H bond by other functional groups, and the development of new catalysts.

azobenzenes ; mechanochemistra ; organometals

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